Which of the following statements is/are correct? \( \mathrm{P} \) ...

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Which of the following statements is/are correct?
\( \mathrm{P} \)
(1) In case of \( \mathrm{Sc} \), the value of \( Z_{\text {eff }} \) is same for
W
electron of \( 3 \mathrm{~d} \) and \( 4 \mathrm{~s} \) orbital.
(2) Value of \( \sigma= \) s \( \) p \( \) d \( \) f
(3) Order of penetration power \( =3 \mathrm{~s}4 \mathrm{p}5 \mathrm{~d}4 \mathrm{f} \)
(4) None of these
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